Engineering selection guide
Size from heat duty, not temperature alone.
A pipeline heater cannot be selected from target temperature or pipe diameter alone. The useful heating duty depends on how much medium flows through the system, how far its temperature must rise, how quickly that change is required and how much heat the pipework and equipment lose to the surroundings.
1. Confirm the medium and flow condition
First identify whether the medium is recirculating air, fresh process air, another gas or a liquid. Yigao's current pipeline heater product page describes a fan-driven electric air-heating configuration. If the project involves liquid, high pressure, corrosive gas or another medium, state that clearly so engineering does not apply air-heating reference data to the wrong duty.
- Medium: composition, humidity, dust, corrosiveness and cleanliness requirement.
- Flow: mass flow when available, or volume flow together with operating temperature and pressure.
- Temperature: minimum inlet, normal inlet, required outlet and maximum permitted temperature.
- Operation: once-through or recirculating, continuous or batch, and daily operating hours.
2. Estimate the useful heat duty
Use consistent engineering units. The formula is a starting point, not a final quotation. Element loading, surface temperature, pressure drop and protection settings still require review.
3. Check pressure drop and airflow protection
The selected fan or circulation system must move the required flow through the heater, duct, filters and production equipment. Excessive resistance can reduce flow and create local overheating. Provide available fan pressure, duct route, bends, filters, damper positions and allowable pressure drop. An airflow or low-flow interlock should be considered so heating power cannot operate without sufficient circulation.
4. Match material, flange and element design
Carbon steel or stainless steel may be reviewed according to temperature, corrosion, humidity, cleanliness and cost. The drawing should define inlet and outlet direction, flange standard, support position, drain point, sensor location, maintenance clearance, junction box direction and insulation requirements.
5. Confirm control and electrical conditions
- Supply voltage, frequency, phase and available electrical capacity.
- Required control accuracy and acceptable outlet-temperature fluctuation.
- Staged contactor, SSR or thyristor control requirement.
- Main sensor, independent over-temperature sensor and downstream process sensor positions.
- PLC communication, remote start, alarm output and emergency stop requirements.
6. Quotation checklist
Send medium composition, volume or mass flow, inlet and outlet temperature, operating pressure, allowable pressure drop, duct and flange drawing, voltage, control requirement, installation environment, destination country, required standards and quantity. If replacing an existing heater, include its power, dimensions, operating problems and site photos.
Buyer FAQ
Pipeline heater sizing FAQ
How is pipeline heater power estimated?
Start with medium mass flow, specific heat, inlet temperature and target outlet temperature. The basic heat duty is mass flow multiplied by specific heat and temperature rise, then heat loss, operating margin and control strategy must be reviewed. Final power should be confirmed from the real process data rather than selected from temperature alone.
Is air volume required when selecting an air pipeline heater?
Yes. Air volume or mass flow is essential because it determines how much medium must be heated each hour. Also provide inlet temperature, target outlet temperature, pressure or fan condition, duct size and whether the system recirculates air.
Can the 6-600 kW and ambient-to-800 C ranges be used for every project?
No. They are reference ranges shown for the current Yigao pipeline heater product family. The achievable outlet temperature and power depend on airflow, heat loss, material, element loading, pressure, control method and installation conditions.
Should stainless steel or carbon steel be selected?
Material selection depends on temperature, humidity, corrosion, cleanliness requirements, pressure and the working environment. State the medium and operating conditions so the shell, flange, element and insulation materials can be reviewed together.
What protection should a pipeline heater include?
Typical items to review include independent over-temperature protection, airflow or low-flow interlock, staged power control, sensor placement, pressure monitoring when applicable, grounding and emergency stop logic. The required protection must match the process and local electrical rules.